*Vertices      7
     1 "t1"                                      0.0529    0.6748    0.5000
     2 "t2"                                      0.2445    0.6695    0.5000
     3 "t3"                                      0.6978    0.8011    0.5000
     4 "t4"                                      0.2684    0.4790    0.5000
     5 "t5"                                      0.5547    0.1429    0.5000
     6 "t6"                                      0.5924    0.4398    0.5000
     7 "t7"                                      0.9324    0.5182    0.5000
*Arcs
      1      2       1 l "a-1"
      1      4       4 l "f-4"
      2      4       2 l "g-2" 
      2      3       2 l "b-2"
      3      7       1 l "c-1"
      2      6       3 l "d-3"
      6      7       3 l "e-3" 
      4      5       4 l "h-4" 
      5      6       1 l "i-1" 
      5      7       2 l "j-2"